Abstract: Embodiments of the present disclosure provide systems and methods for testing a device for grid interconnection standards. The method includes inputting a set of instructions to a device under test (DUT), where the instructions correspond to a firmware version to be tested by a variable AC source. The method includes transmitting a command signal to an inverter redundant controller (IRC) of the DUT, where the IRC operates at least one DC-AC inverter to attain a grid-tie state in response to receipt of the command signal. The method includes transmitting a set of values corresponding to parameters of the variable AC source configured to simulate an AC grid upon operating at least one DC-AC inverter in the grid-tie state. The method further includes accessing test output data of the DUT from measuring equipment and generating a test report based on responses of the DUT to a set of test waveforms.

Abstract: A method includes controlling multiple networked input-parallel/output-parallel inverters of a fuel cell system as a single inverter assembly by a master controller. A fuel cell system includes a plurality of fuel cell segments, a plurality of DC/DC converters and at least one DC/AC inverter, where an output of each of the plurality of the fuel cell segments is connected to a pair of DC/DC converters, and each of the pair DC/DC converters is connected to an opposite polarity bus being provided to the inverter.

Abstract: A method includes controlling multiple networked input-parallel/output-parallel inverters of a fuel cell system as a single inverter assembly by a master controller. A fuel cell system includes a plurality of fuel cell segments, a plurality of DC/DC converters and at least one DC/AC inverter, where an output of each of the plurality of the fuel cell segments is connected to a pair of DC/DC converters, and each of the pair DC/DC converters is connected to an opposite polarity bus being provided to the inverter.